Saint Johns River - Great Marsh Island Wind ForecastUnited StatesFLDuval CountySaint Johns River - Great Marsh Island1-Day3-Day5-Day Graph Plots Open in Graphs Wind Forecast NOAAWind Real-Time Saint Johns River - Great Marsh Island wind forecast issued today at 8:30 pm. Next forecast at approx. 8:30 am.Get WillyWeather+ to remove ads